Opt Lett. 2023 Feb 15;48(4):952-955. doi: 10.1364/OL.480724.
In this Letter, an in-fiber dual-channel surface plasmon resonance (SPR) sensor is reported that uses polydimethylsiloxane (PDMS)-filled C-type microstructured optical fiber (COF). The COF is made of HF-acid-etched single-sided hole optical fiber (SSHF), and its inner and outer sides are coated with gold film to stimulate SPR. The inner channel is filled with PDMS and acts as the temperature measurement channel, and the outer channel is directly in contact with the salt solution and acts as the salinity measurement channel. Experiments show that the sensor is qualified to detect salinity and temperature simultaneously, and it exhibits a salinity sensitivity of 0.296 nm/‰ in the salinity range of 0-153.32‰ and a high temperature sensitivity of -2.4 nm/°C in the temperature range of 22-44°C. Furthermore, the sensor also enjoys good hysteresis, repeatability, and reversibility in salinity detection. In a word, the high sensitivity, simple preparation, and good integration of the proposed sensor endow it with the potential for deep-sea exploration.
在这封信件中，我们报告了一种基于填充 PDMS 的 C 型微结构光纤（COF）的光纤双通道表面等离子体共振（SPR）传感器。该 COF 由 HF 酸刻蚀的单侧孔光纤（SSHF）制成，其内外两侧均涂有金膜以激发 SPR。内通道填充 PDMS 并用作温度测量通道，外通道直接与盐溶液接触并用作盐度测量通道。实验表明，该传感器有资格同时检测盐度和温度，并且在 0-153.32‰的盐度范围内表现出 0.296 nm/‰的盐度灵敏度和在 22-44°C 的温度范围内具有-2.4 nm/°C 的高温度灵敏度。此外，该传感器在盐度检测方面还具有良好的滞后性、重复性和可逆性。总之，所提出的传感器具有高灵敏度、简单的制备方法和良好的集成性，有望用于深海探测。
